4.1.9.8 Project Representation Context

A project representation context indicates the coordinate system orientation, direction of true north, precision, and other values that apply to all geometry within a project or project library. A main geometric representation context is created for 3D model, and 2D representations, both can be further refined using geometric representation sub contexts.

The following diagram shows the generic classes and relationships used when applying this concept. In addition, concepts may have particular importance to common or standardised industry practices and scenarios. For these specific usage scenarios, the table below shows a recommended list of general usage patterns that users may adopt.

Figure 4.1.9.8.A

General Usage

ApplicableEntity	ContextIdentifier IfcGeometricRepresentationContext.ContextIdentifier	ContextType IfcGeometricRepresentationContext.ContextType
IfcProject	Model	3D
IfcProject	Plan	2D

Table 4.1.9.8.B

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